Nanoscratch on mechanical properties of interfacial transition zones (ITZs) in fly ash-based geopolymer composites

Li, W; Luo, Z; Gan, Y; Wang, K; Shah, SP

Nanoscratch on mechanical properties of interfacial transition zones (ITZs) in fly ash-based geopolymer composites

Li, W

Luo, Z Gan, Y Wang, K Shah, SP

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Publisher:: ELSEVIER SCI LTD
Publication Type:: Journal Article
Citation:: Composites Science and Technology, 2021, 214
Issue Date:: 2021-09-29

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Field	Value	Language
dc.contributor.author	Li, W https://orcid.org/0000-0002-4651-1215
dc.contributor.author	Luo, Z
dc.contributor.author	Gan, Y
dc.contributor.author	Wang, K
dc.contributor.author	Shah, SP
dc.date.accessioned	2022-05-04T12:30:08Z
dc.date.available	2022-05-04T12:30:08Z
dc.date.issued	2021-09-29
dc.identifier.citation	Composites Science and Technology, 2021, 214
dc.identifier.issn	0266-3538
dc.identifier.issn	1879-1050
dc.identifier.uri	http://hdl.handle.net/10453/157004
dc.description.abstract	Interfacial transition zones (ITZs) of cementitious concrete are highly heterogeneous, which cause many challenges in accurately obtaining their properties. In this paper, regular aggregates were applied to prepare modelled geopolymer composites, in which ITZs exhibited neat boundaries. Nanoscratch technique with the ability to quickly scan a long distance was adopted to investigate mechanical properties of ITZ and geopolymer paste. To compare the properties of the ITZs and paste, abundant scratch data were analyzed in the form of histograms and Gaussian mixture models. The results showed that the ITZs in geopolymer with silica modulus of 1.5 presented similar properties with the paste, while the ITZs in geopolymer with silica modulus of 1.0 showed significantly higher scratch hardness but lower scratch friction coefficient than paste. Deconvolution analysis revealed that the abnormal hardness and friction coefficient of the paste in geopolymer with silica modulus of 1.0 could be caused by the defects related points. Compared with the traditional scratch scheme, the parallel scratch scheme based on modelled ITZ gave more stable results with a given number of test data, which can provide in-depth information for comparative studies.
dc.language	English
dc.publisher	ELSEVIER SCI LTD
dc.relation	http://purl.org/au-research/grants/arc/DE150101751
dc.relation.ispartof	Composites Science and Technology
dc.relation.isbasedon	10.1016/j.compscitech.2021.109001
dc.rights	info:eu-repo/semantics/closedAccess
dc.subject	09 Engineering
dc.subject.classification	Materials
dc.title	Nanoscratch on mechanical properties of interfacial transition zones (ITZs) in fly ash-based geopolymer composites
dc.type	Journal Article
utslib.citation.volume	214
utslib.for	09 Engineering
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology/School of Civil and Environmental Engineering
pubs.organisational-group	/University of Technology Sydney/Strength - CBI - Centre for Built Infrastructure
utslib.copyright.status	closed_access	*
dc.date.updated	2022-05-04T12:30:05Z
pubs.publication-status	Published
pubs.volume	214

Abstract:

Interfacial transition zones (ITZs) of cementitious concrete are highly heterogeneous, which cause many challenges in accurately obtaining their properties. In this paper, regular aggregates were applied to prepare modelled geopolymer composites, in which ITZs exhibited neat boundaries. Nanoscratch technique with the ability to quickly scan a long distance was adopted to investigate mechanical properties of ITZ and geopolymer paste. To compare the properties of the ITZs and paste, abundant scratch data were analyzed in the form of histograms and Gaussian mixture models. The results showed that the ITZs in geopolymer with silica modulus of 1.5 presented similar properties with the paste, while the ITZs in geopolymer with silica modulus of 1.0 showed significantly higher scratch hardness but lower scratch friction coefficient than paste. Deconvolution analysis revealed that the abnormal hardness and friction coefficient of the paste in geopolymer with silica modulus of 1.0 could be caused by the defects related points. Compared with the traditional scratch scheme, the parallel scratch scheme based on modelled ITZ gave more stable results with a given number of test data, which can provide in-depth information for comparative studies.

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http://hdl.handle.net/10453/157004